[SSLManager] Fixed saving IgnoreAllWarnings option.

Closes #890
[Compile] Fixed Q_(UN)LIKELY redefition warning.
[Win] Use custom user-agent for facebook.

Fixes facebook chat.

See #867
[Win] Updated installer + fixed previous commit.

Conflicts:
	windows/installer.nsi
[Win] Fixed all warnings in Windows installer.

Also added Serbian Latin translation files.